Funding for this research was provided by:
Merck KGaA
Article History
Received: 28 January 2019
Accepted: 29 May 2019
First Online: 14 June 2019
Compliance with ethical standards
:
: Meritxell Sabidó is an employee of Merck KGaA, Darmstadt, Germany. York Zöllner and Mohammed Dagher have no conflicts of interest to declare.